HAS MULTIPLE PARTS, PLEASE ANSWER ALL

When constructing the argument for a bagging tree strategy, the varImpPlot function displays feature importance graphically. For this we set the type argument to either equal 1 or 2. If type = 2, then what does this command?

• to show the average decrease in the predictive variable mean in a percentage form

• that R will use the average decrease in the Gini impurity index to compare the feature importance

• to show the feature importance as the average decrease in overall accuracy

• that R will use the average increase in the Gini impurity index to compare future importance

• Based on the Gini index, 0.10 implies a higher degree of purity because it is closer to 0 than 0.5.

  T or F

• Before constructing a decision tree, one of the first steps is identifying possible splits of the predictor variable.

  T or F